Lifting-jack



J. G. SAUER.

LIFTING JACK.

APPLICATION man FEB. 18. 1920.

Patented mm. 19211.,

2 SHEETSSHEIET 1.

R: g 3N VEN TOR.

{4 ATTORNEYS.

J. G. SAUER.

LIFTING JACK.

APPLICATION FILED FEB. 18. 1920.

Patented Oct M,

2 SHEETS-SHEET v mechanism;

' pr from either side.

arenn eno. sauna, or'nocnns'r, new roan.

naeaaeta Specification of'Let-ters Patent.

' App1lcation filed February 18, 1920. Serial No. 359,500.

To all whom it may concern:

Be it known that I, JOHN G. SAUER, a citizen of the United States, andresident of ochester, in the county of Monroe and tate of New York, haveinvented certain new anduseful Improvements in Lifting Jacks, of whichthe following is a specification. v v

The present invention relates to'lifting jacks, and an object thereofisto provide a lifting jack which has strength and durability and at. thesame time a maximum amount of power Another object of the of theinvention is to provide a. lifting jack whichmay be operated fromthe'rear thereof To these and other ends, the invention consists ofcertain parts and combinations of parts all of which will be hereinafterdescribed, the novelvfeatures being pointed out in the appended claims.

In, the drawings in elevated position;

Fig. 2 is a central Vertical section of such jack in the position shownin Fig. 1;

Fig. 3 is a side view of the jack in lowered position; v t V Fig. 4 is afragmentary detail view of the connection between the 'base and thelower links of one of the toggles Fig; 5 is a fragmentary detail view ofa.

knuckle of a toggle of the rough adjusting Fig. 6 is-a detail view ofthe connection between the lifting member and one of its to gles;

igs. 7 and 8 are detail vlews of the connection between two of theweighted'pawls;

' Figs. 9 and 10 are detail views of the operating' member for the jack;and

Fig. 11 is adetail view of the ratchet.-

In the illustrated embodiment of the in- ,vention there is-provided alifting bar formed in this instance of two. pieces of. angle iron 1connected together by tie pieces 1', each having oneof its flangesdisposed outwardly and horizontallyand supporting a casting 2 preferablyformed with intersecttogether by tie pieces 7.

vrnember may be provided with a mg a squared socket in which a wrenchmay mg ll-shaped notches 3 and-4, the casting 2 being preferablydetachably secured at 5 to the flangesby bolts, dowel. pins or othermeans. This bar is, in this instance, adjustably supported on asupporting framecompr1s1ng preferably two plates 6 connected Patentedoct. 11, rear..-

v The adjusting meansfor moving the lifting member relatively frame inthe illustrated embodiment compr ses a-pa-ir of togglesL, each togglebeing formed of two pairs of links, the lower links 8 ;of each togglebeing pivotally mounted on pivotirods -9 connecting-theplates 6, whileto the supportingthe upper links 10 of each toggle are pivotally}mountedon pivot rods '11 connecting the angle irons l and held thereonby nuts 11. The links 8 and-10 of each toggle are preferablypivotallyconnected to aknuckle fin 12 on which the links are held by nuts 13.ovement of the toggles may beeifected by an adjusting shaft 14, whichmay have right and lefthand threaded portions 15 and 16 engaging inscrew threaded openings formed 1n the knuckle pins and'rotation'of thisscrew in one direction breaks the toggles by moving them toward eachother, thus lowering 'the lifting bar,

. while movement of the screw in the other Figure 1 is an end viewsection of the jack direction expands the toggles and elevates thelifting bar. Oneend Of theadjusting head 17chavbe fitted in line withthe adjusting'member.

To the end that the wrench may be used at right angles to the adjustingmember, a socket member 18 may be provided having sockets in oppositefaces thereof, and rotatable" in bearings. 19 about an axisat rightangles to the axis of the adjusting member 14:. This socket member is,1n this instance, formed with a worm face 20 which cooperates with aworm face 21 on the socketed head 17 of the adjusting member 1a; The

12 of the two toggles,

bearings 19 are provided in atwo part frame 22 which is secured aboutthe adjusting member 14 between the-head 17 and a collar 23 thereon byscrews 22. The supporting frame formed by the plates 6 "may in turn beadjustably supported on a base'24, in this instance, in the form of a"channel member, with the side flanges 25 of the chamber presentedupwardly. The adjusting means between the basemember and theintermediate. supporting frame formed by the plates 6 is so constructedthat a quick berof each v links ,indicatedat 30,1said links being p1vot-.ally. mounted on a pivot rod 9 on which the two pairs on apivotrod 27,a spacer 28 be-f ing provided between the members of each pair and nuts29 being arranged between the .two pairs'tosecurethe links againstmovein its adjusted position, a plurality ofpawls ment on the'pivot rod27. Th up er memtoggle is also forme links 8. are. pivoted and beingarranged in two pairs with spacers 31between them, the link 8' beingarran 'ed between the two pairs and nuts 32 'beingarr'anged to hold thelinks 8 as well as the links 30 against movement on the; pivot rod 9.The two parts .of each toggle have their links pivot ally connected to apiv0tr6d-33, spacers 34 being provided on the pivot rod between eachpair of links .30, and each pair'of links 3O being arranged on the'pivotrod 33 between the members of a pair oflinks 26. A

-spacer '35 is also provided on the pivot 'rod 33"between the two pairsof links 26,.and-

nuts 35* secure the parts in operative relation. flo elevate theintermediate frame formed by the plate 6 with reference to thebase 24,the intermediate frame is raised and-the links26 and 30automaticallyswing on their pivot until the desired height of the intermediate frameis reached. 7

In order to sebure the intermediate frame 36 are provided, said pawlsbeing pivoted at i 37 on lugs 38 which-are projected inwardly from thelinks 26, each [pawl being pivoted to-both members of each pair of links26 and 'opera ting between such members so as to oooperate withr'atchetteeth 39 formed on the spacers 34, such spacers 34 being keyed to thepivot pins 33 and said pivot pins in turn being keyed-to the links 30.Each pawl is provided with a weight 40, which normally tends to holdsuch pawl'in cooperation with. its ratchet-39 so that, as theintermediate frame formed by the ;pl ate 6 is raised, the

pawl will automaticallylock the intermedi-.

'ate framein its raised position. Release of the pawls may be secured bychains 41 which.

are connected at 42 to a tie-piece 7,b etween the plates '6 and whichhave their othenends connected with yokes 43 and 43?, each of said yokesconnecting two of the weights 40.

I I 'Thevopposite weights 40 are offset so that they may lie one besidethe other when the jack is folded. Link 44 may be provided on theconnections 41 for attachment'to' books 45 arranged on the inner facesof the strips I 6 to'hold said weights in positions where the pawls ..36will the ratchets 39."

The operation-of the screw 14 may be efbe out .of cooperation with offour fected by an operating tool comprising, in 'thi instance, anextensible stemyformed of a plurality of telescoping sections 46,connection between the sections'being provided by forming longitudinal{slots 47 and inwardly turned lugs 48 on some of the sections, the lugsextendinginto said slgts and permitting the relative longitudinalmovevment of the sections, while preventing rela- In the use of thejack, the latter is firstop'erated to bring the lifting bar or member ascloseas possible to the intermediate support formed by the plates 6,while the intermediate support is brought as closely as possible to thebase 24. The ack is placed beneath the part torbe elevated, and theintermediate support formed by the plate 6 is raised until the liftingbar engages with the part to be elevated, at which time the pawls 36will lock the rough adjusting mechanism in: its adjusting osition. Theoperating tool illustrated in *igs. 9 and 10 isv then connected to thesocket member 18 permitting the or to the socket member 17, depending onwhich is most conveniently reached, and the screw 14 is turned toelevate the lifting bar and the part engaged thereby until the desiredelevation has been reached. In lowering the jack, the screw 14 may beturned or the jack may be lowered quickly by disengaging the pawls 36with the ratchets 39.

From the'foregoing it will be seen that \there has been provided aliftin jack formed with a rdugh adjustiiig mec anism and a poweradjustment. The rough ad-- justment may be quickly obtained, while thepower adjustment gives great power. Both the adjusting mechanisms aresim la in operatlon and have great durability and strength. Provision ismade by which the "jaizk may be operated from any 'side.

What I claim as my invention and desire to secure byLettersPatent 'is: Q

.1. In a lifting jack, a,lifting member formed of two angle ironsarranged in spaced relation, each-having a flange prothe supportingframe with the lifting member", anda block detachably secured to theflanges of-the lifting member and formed with intersecting notches. ,o2. A lifting jack comprising a supporting member, a. lifting member'adjustably supported-onlsaid, supporting member, ahorizontallyarranged' screyt for operating the meager lifting memberwith reference to the supporting member, said screw having an operatingportion at one end, and an auxiliary operating member for the screwoperable from either side of said screw at an angle to the axis of thescrew and geared to the screw to transmit motion thereto.

3. A lifting jack comprising a base, a lifting member, a supporting.member between the base and the lifting member, toggles con- Y .nectingthe base and the supportingme mber,

and toggles connecting the supporting member and the lifting member.

4C. A lifting jack comprising a base, alifting member, a supportingmember betweenthe baserand the lifting member, two quick adjustabletoggles connecting the base with "ing the base and the lifting member,adjustin the supporting-member, and power adjusting means between thesupportingmember and the lifting memberg. W

- 5. A lifting jack comprising a base, a lift: member, a supportingmember between tilt means between the supporting member and the liftingmember, a toggle between the base and the supporting member, and a pawland ratchet controlling the position of the toggle.

6. .A member, a base, a supporting member, adjusting means connectingthe supporting member with the lifting member, a toggle connecting, thebase with the supporting member and having a tooth member at itsknuckle, and a weighted pawl cooperating with said tooth member.

7. A lifting jack comprising a lifting member, a supporting frame onwhich the lifting member is adjustable comprising two plates, pivot rodsconnecting said plates, a

. ase formed from a channel member with its flanges extending upwardly,pivot rods connecting said channel members, and two toggles mounted onthe pivot rods of the supporting frame 7 and the base.

lifting jack comprising a lifting JOHN eno. sAimR.

